package online.test1;

/**
 * @Author 28021
 * @Date 2022/10/10
 */
public class StringBuilderTest2 {
    public static void main(String[] args) {
        int[] arr = {1,2,3};
        String str = arrToString(arr);
        System.out.println(str);

    }
    public static String arrToString(int[] arr ){
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        for (int i = 0; i < arr.length; i++) {
            if(i == arr.length -1){
                sb.append(arr[i]);
            }else{
                sb.append(arr[i]).append(",");
            }
        }
        sb.append("]");
        return  sb.toString();//sb为容器，变为字符串
    }
}
